Spool-head.



0.'] E`. FORSBERG. sP'oonHEAD. 'APPLICATION FILED DEO. 18, 1909.4

1,100,178, Patented June 16,1914.

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OSCAR F. EoRs'BERG, lor NEW YoRx, N. Y., AssIGNoR To WESTERN ELECTRIC COMPANY, or NEW YORK, N. Y., A CoRPoRATIoN or ILLINoIs;

SPOOL-HEAD.

Specification of Letters Patent.

Patented June 16, 1914.

Application iled December 18, 1909. Serial N o. 533,946.

To all whom it may concern.'

Be it known that I, OSCAR F. FoRsBEnC, citizen of the United States, residing at New York, in the county of New York and lState of New York, have invented a certain new and useful Improvement in Spool- Heads, of which the following is' a full, clear, concise, and exact description.

' This invention relates to electromagnet `Inay be connected, and wlth at least one of which terminals an outside circuit may be removably connected in an efficient and satisfactory manner.

To the above end my invention comprises, in connection with a terminal to which an end of the magnet coil may .be connected, a screw-receiving element which is securely held in the body of the spool head and is electrically connected to said terminal.

My invention will be understood from the following description taken in connection with the accompanying drawings in which# Figurel isa sectional transverse view of a spool'headhaving my invention embodied therein; Fig. 2 isa fragmentary partly sectional view showing in detail the portion of the device in-which my invention particularly resides; Fig. 3 shows the outer side of the collar as applied to a magnet spool; Fig. 4 shows the inner side of the collar; and Fig. 5 is a side elevation, partly in section, of a magnet equipped with a spool head of the kind shown in the other igures and having my invention embodied therein.

Fig. 5 shows a magnet 1 equipped with a spool head constructed in accordance with this invention. The spool head comprises a collar 2 of fibrous .insulating material ',toI

which are secured the terminals 3, 4, preferably of brass coated with tin. The terminal 4 is of the usual construction, being riveted to the head by a brass eyelet 6, and having one of its ends 5 bent and embedded in the liber, the opposite end being struck up to. form lugs to which a wire may be soldered.l The'terminal 3 is similar to the terminal 4in that it is also provided with lugs and'is partially ,secured to the collar 2 by an eyelet 6;- theterminal 3 has, however, certain other features vhereinafter de# scribed, and to which my invention particularly relates.

The ends of the magnet coil or helix are brought out through tlie eyelets 6 and Iare soldered to the outside thereof. These wires are, therefore, not only protectedfrom breakage but are also guarded against contact with the fiber head 2 and the corroding action which might otherwise take place.

In order to provide an elicient spool head of this character adapted for machine woundy spools, it is necessary that the construction be such that no portion of the con? necting devicev essentially a part of the spool head during the winding operation, in the present instance a screw-receiving element,

shall protrude beyond the inner surface of the collar. This portion of the connecting device should be also practically integral with the terminal. To provide a seatffor the connecting device 8, the contour of the usual form of collar is modified by forming the collar 2 with a Aradially-extending lug, and forming the terminal 3 with an integral extension 7 positioned radially on said lug, lying flush with the face thereof. From the inner face of the lug, opposite the face supporting the terminal 3, a nut 10 may be rigidly countersunk substantially flush with the inner face of the lug. As shown this nut may be hexagonal in shape and. the opening inthe lug into which it is forced may be round, the effect of theforcing of said nut into said opening being .to embed` the sharp corners of the nut into the sur rounding edge of the opening. A hollow or thimble-like extension`9, integral with said nut, extends through an opening in the extension 7 of the terminal 3 and isl spun around the edge of said opening thereby providing a construction whereby the nut l0 is practically integral with the terminal 3, insuring continuous metallic connection between. the terminal'l and the nut, and since the nut is countersunk substantially flush with the` inner` face of the collar 2, there will be no interference with'the wire during the winding operation. A screw 11 may be threaded into engagement with the nut 10,

said screw having a relatively-large head, preferably as large as the face of the nut l0, to provide aiirm means of connection for a conductor. This screw is not placed in the nut .until after the magnet has been wound, and its end is then upset to revent .its entire withdrawal therefrom. T e con- It will be evident that by virtue of the# present invention a means of connection' is provided between the' terminal -'f "a spool ead and a conductor which hasall the ad-l vantages of a solder connection whilel avoid ing its disadvantages. c

p-Having thus described my invention, I claim 1., A spool head comprising a collar, a helix terminal mounted upon' one face of said collar and having a metallic extension, an eyelet passing through said collar and said terminal, and a conductor-securing device passing through said collar and said extension and secured thereto.

2. A spool head and collar a helix terminal riveted to the outer face of said collar and having a metallic extension, a metallic screw-receiving element countersunk in the inner face of said collar and electrically connected with said extension, and a screw passing through said element.

3. In a spool head, the combination with a collar, of a terminal mounted on one side thereof, a nut eountersunk in said collar from the opposite side and being metallically connected with said terminal, and a screw adapted to enga e with said nut.

4. In aspool head, t e combination'with a collar, of a terminal mounted on one side thereof, a nut countersunk in saidcollar from the opposite side and having a portion thereof extending through said collar and having metallic connection with said terminal, and a screw adapted to engage.

my name this 17th day of December A. D., 1909.

OSCAR F. FORSBERG. Y Witnesses:

IRVING MACDONALD, EDGAR F. BEAUBIEN. 

